<div *ngIf="hero">
  <h2>{{hero.name}}</h2>
  <div><label>id:</label>{{hero.id}}</div>
  <div>
    <label>name:</label>
    <input type="text" [(ngModel)]="hero.name" placeholder="name">
  </div>
  <button (click)="goBack()">Back</button>
</div>
